Quartz-mill



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v @ww/fg@ Pzene Jag. 25, A952? 51156219 0f@ H/[Ml all p in sx'rns EDWARDT. STEEN, OF SAN FRANCISCO, CALIFORNIA, ASSIGNOR TO I-IIMSELF, AND B. S.

NICHOLS, OF SACRAMENTO, CALIFORNIA.

QUARTZ-MILL.

Specification of Letters Patent No. 25,234, dated August 28, 1859 To allwhom it may concern:

Be it known that I, EDWARD T. STEEN, of San Francisco, in the county ofSan Francisco and State of California, have invented a new and usefulQuartz-Stamping Mill; and I do hereby declare that the following is afull, clear, and exact description of the same, reference being had tothe accompanying drawings, forming a part of this speciication, inwhich- Figure l represents a longitudinal vertical section of my mill.Fig. 2 is a transverse section through the middle of the steam chest,the other parts being represented in elevation.

Similar letters of reference in both views indicate corresponding parts.

This invent-ion relates to that class of mills in which the stampers areoperated by steam; and it consists in arranging two stampers in a doublecylinder in such a manner that by the action of the upper ends of thestems of the stampers-which at the same time form the steam pistons-asthey strike against two valve pistons, the steam is charged, and it isconducted to the two cylinders by means of cross passages arranged insuch a manner that when the steam is admitted to one cylinder on thetop, and it exhausts from the bottom; it is admitted to the bottom ofthe other cylinder and exhausts from the top, and vice versa; and thechange of steam is effected by means of two valve pistons, which areconnected by a rocking lever, from which an arm extends down to thevalve so that when one of the main pistons rises and strikes against thevalve piston so as to raise it, the valve is thrown the full distance,and the full power of the steam is admitted to the cylinders at once.

To enable those skilled in the art to make and use my invention I willproceed to describe its construction and operation.

A represents the bed which supports the dies, B, and the mortar, C. Thebottom of.

the mortar rests on a bed of india-rubber, D, and it does not come up tothe sides of the mortar, but leaves a space, a, which is also packedwith india rubber so that the shock caused by the blows of the stampersis dissipated and its injurious effect on the machinery considerablydiminished if not entirely done away with. The mortar, C, is constructedin the usual manner, and it may be supplied with a feed spout on oneside, screens at each end and front and a conductor for the water, &c.

E are the stampers, the rods, b, of which are guided in a plate, F,which is supported by four columns, 0,' and attached to the' upper endof these rods are the steam, or main pistons, G G', which work in thesteam cylinders, I-I H. These cylinders are supported by a platform, I,which rests on the top of the columns, c, and those parts of theplatform, I, through which the rods, b, pass, are provided` with stuingboxes, CZ. The pistons are constructed of two rings filled in with softexpansion metal, and a hole is bored in the tops which is lled withhighly vulcanized india rubber to. prevent a shock when the pistonsstrike against the lower ends of the valve pistons, J J which extendthrough the covers of the cylinders. The two cylinders are cast out ofone piece and steam is admitted to, and exhausted from, then by ports,c, e and 6*, the port, 6*, communicating with the exhaust pipe, f. Thesteam ports, c c', cross each other, as clearly represented in thedrawing, one passing below the other, and they .communicate with thecylinders by means of openings, g, gf, g gh?, in the sides of thecylinders. The ports, e, c and 6*, lead into the valve chest, K, whichcommunicates, by means of a suitable pipe, with a steam boiler, andarranged in this steam chest is a common B- valve, M, which is operatedby means of a rocking beam, L, which is fulcrated on a pin or axle, e',and from which the valve carrier, it, extends down to the valve. Theends of the rocking beam, L, are pivoted to the upper ends of the valvepistons, J J, which latter work in stulling boxes, y', and which, whenin their highest position, strike against the cover of the valve chest.These valve pistons are thrown up alternatclyby the actions of the mainpistons and indiarubber cushions, v, are inserted in the cover of thevalve chest in order to dissipate the shock which otherwise would bevery injurious to the machinery, if the valve pistons should strikeagainst the bare metal. The axle, z', of the rocking beam extendsthrough the sides of the steam chest, and a handle, N, is attached toit, whereby the slide valve, M, can be operated by hand.

The operation is as follows: When the valve, M, is brought into aposition, as represented in Fig. l, with the stamper, E, raised, thesteam enters through the port, e, into the upper part of the cylinder,H, and into the lower part of the cylinder, H, and it exhausts from thebottom part of the cylinder, H, and from the top part of the cylinder H.The piston, G, is depressed, and the piston, G, together with thestamper, E', is raised. As the piston G, strikes against the lower endof the valve piston, J the position of the rocking beam, L, and with itthe posit-ion of the slide valve, M, is changed, and steamY is nowadmitted through the port, e', to the bottom part of the cylinder, H,and to the top part of the cylinder, H, and the port, e, is brought incommunication with the exhaust pipe, 6*, so that the steam exhausts fromthe upper portion of the cylinder, H, and from the lower portion of thecylinder, H. By this arrangement the stampers can be operated veryrapidly and the power of the blows may be increased at pleasure as itmainly depends on the pressure of the steam. And

by the arrangement of the india rubber cushions under the bottom of themortar and in the top of the pistons, G G, and also in the respectivespots of the cover of the valve chest, the shock of the blows isdissipated in such a degree that the machinery sustains no injury evenwhen operated at a Very high rate of speed.

What I claim as new and desire to. secure by Letters Patent is:

The employment of stampers, E E', when the same are operated by means ofsteam cylinders, H H, which communicate bythe cross passages, e e, thechange of steam being effected by valve pistons, J J operating on aworking beam, L, and operated by the pistons, G G, the whole beingarranged and Combined, substantially in the manner herein described.

EDWARD T. STEEN.

Witnesses:

J. FRANK STEEN, GEO. RoBINs.

